Artificial tooth and method of making the same



APPLICATION FILED JULY 25,1918.

Patented July 27, 1920.

. awwzwboz Eduard'fg wamm UNITED STATES" PATENT OFFICE.

'nnwnnn rnm'z orn, or irnrmnnnrn e, PENNSYLVANIA, ASSIGNOR TO'=THE i nnN-ns'rs"surrnr 'oournmf; on New YORK," 1v: 2:, A "conrona'rroa or" 'maw aroma I marinara moon-I Ami METHOD-10h MAKING-min sari-E.-

Specification-ofLettersPatent. Patented J ly-27 1920 Application flledluly 2l5, 1918. Serial no 246,681

To all whom it may concern:

Be it known that lyEhwnm) PriL'raOrr, a citizen of the {United States, and re'side'nt of Philadelphia, county of Philadelphia, and

btate of Pennsylvanimhave invented an lm provement in Artificial T ejethland Method of Making Same, of which the following is a Specification. V J V i My invent'on hasiforits objectthe construction of an artificial tooth provided with said pin eithersolder ed within an a pin,

the

anchor which is mechanically appliedto tooth proper or-directly proper after vitrification andin which the attachment of the anchor or the pin is'i aoapplied to the tooth complished by fiangi-ngthe inner end thereof by pressure upon a less conical bottom at the base of thehole within the causing the flange to be forced into an annular undercut,portion or groove latthe j base of saidhole. v p p I More particularly, myobject is toenable the attachment ofthe anchor or pin mechanically to the tooth socket after :vitrification or burning, whereby the anchor and pin may melting temperature than the vitiifyi ng I secondary operation;-

num,

temperature I required: to convert the bisque 7 of the toothinto porcelain. As a result of this, I am-en'abled tojuse anchors andpins of gold or suitableialloysfln place of plat1 largelyemployed for anchors and pins :secured in the bisque at: time of vitrification, and I may thus insure a saving of approximately 75 percent. or. more of the cost for the metal for these-parts,

In certain forms -ofmy -invention vthe anchors are mechanically attached to the vitrified tooth in themanner hereinafter curved and more or back of the tooth} and thereby j tom the hole beingfshapedlin a more oi" lessconical form to act as a diito spread the flange when'the anchor on pin is forced inward.

lily inventionconsists in the improved tooth structure and the method of making the same as defined initheiclaims; and my invention will be better understoodby- 7 reference to the drawings, in which:

Figure 1 isa sectional:'view'through an. artificial. tooth embodyingr my invention; F g. 2is a perspective viewofthe anchor tube before being applied to the tooth; Fig. 3 is a perspective view of "theanchor 'or bushing showing the shape assumed after being forced into the hole inthe tooth; Fig. 4 is a sectional view showing themethod of-applying the anchor innthe hole of the tooth; Fig. 5 is'a sectional view illustrating the :manner of molding .a bisque'tooth suitable for my invention; Fig-6 is:a sectional View illustratingmy invention in which the-pin isidirectly' attached to the I tooth; and ig. 7 is a sectional-view show-' 'ing my 1nvention' as applied to a of composite form.

be made of a metal having lower.

which; latter has heretofore been shaped attached to the vitrified tachment of the anchor or: pin consistsin providing zanT-innerannular edge which when forced into the hole of the tooth, spreads outwardly into a flaring rim which fits into an undercut groove in thebottom of the hole in the tooth, the extreme bot- 2 is the vitrified or porcelaintoothiand is provided with a hole 3 in its back-sportion, the bottom of the hole having .a raised hump d of amore or less conicalform and the base of the hole EhaVing a lateral slopes upward into the side walls of the j conical hump l. The generalshape of the tooth may otherwise be made asdesired to suit the particular use of the tooth, the invention being applicable to anterior and posterior teeth of alldescriptions, such as. vulcanite facings and crowns."

Whenthe porcelain tooth has been molded and'vitrified, the anchorand pin maybe attached, the former mechanically and the latter by soldering. In molding the bisque tooth preliminary to burning the core for shaping thehole 3 may beamade of any suitable material whichwvillburh or fuse and thereby be removed atttiine. of vitrify ing,.a methodwhich iswell understood in the art of molding.

undercut groove 5, the bottom of which I i A suitable manner of inolding the bisque i i is illustrated in Fig; 5. 10 and 11 are the two parts of the mold, 2 is the tooth space. A metal post 13 is loosely su ported in the hole 12 in part 10 of the molc and its upper 1 end 14 is shouldered and serted in "thehole 80f the tooth and, by"

loid :or other fusible or combustible core shape. The bisque is molded about the pin 13 and core 15 {and after'removal and dry-, ing the pin 13 is removed and the bisque tooth vitrified by burning. out the core 15 and leaves the hole as indicated in Figaland 4. 7 The tubular anchor 6. (Fig. 2) is next inmeans of a plunger tool' lS (F ig.4) having an extens1on19 entering the anchor and an annular shoulder which presses .upon the outer edgejof the I'anchor, the anchor is forced downward into the hole. The result of'this is that the lower part of the anchor is spread by the conical bottom 4' ofthe-hole as indicated in F ig; 4 and ultimately caused to substantiallyfill the annular undercut groove 5 by being crowded thereinto, as shown at 7 1n F 1g. 1. In this manner the anchor is mechanically introduced and attached in the tooth; The'tool 18 is then v withdrawni The pin Smay now besoldered in position in the usual manner, the solder being indicated at 9 in Fig. 1. In attaching the pin a small piece of'solder is first introduced into the anchor 6 and the pin placed 'in the holeand anchor upon the solder.- By

subjecting'the tooth to a temperature sufficient to melt the solder the-pin becomes firmly soldered in position and solder runs downabout theconical part of the tooth and stiffens thatportion of the anchor which is flared at the bottom.

'lVhere the separateanchor is to'belomitted and the pin is to be directly anchored in the tooth, the construction may be as shown in Figs. 6 and 7. In the particular construe "tionfshown-in Fig. 6 the'lower end of thepin 8 is' boredout to provide an annular end. .This, when driven down is-fl'ared outward'as in the case of the anchor'or 'bus'h-' ing and the annular flange 7 'tight1y fits the groove 5 of the tooth. In Fig. 7,"the'pin is of acomposite character, being made of a thin tube 8 of metal (corresponding to an elongated anchorlwhich is attached in place just as the anchoris attached; the pin may then be filled with solder 8 a head S having. a shank fitting down into the-tubular body and soldered inplace. It is evident that-this" shank ofthe head may extend sufficie'ntly downward to tional strength if-so desired. v V V The anchor may be of any metal'to which the pin maybe soldered, but gold'isprefer able because unaffected by" the acids of the mouth. The. anchor may be made as a thin supports a cellu- This act burns,

' having a hole whose and fitted with give addi- I I have .describedlmy. improved method and means in that particularity which I deem to be the best exposition of my invention, and that which I prefer in commercial practice, but I donotrestrict or confine myself to the minor or secondary details as such variations, within the scope of the claims, may be resorted to as matters of mechanical skill and without a departure from the spirit oftheinvention; a

' Having now described my invention what I claim as new and desire to secure by Letters Patent,.is: r

r 1. An artificial tooth having a vitrified body provided with a hole having at the bottom alateral curved undercut groove, com bined with a metal anchor mechanically fitting the hole and attached in the bottom of the hole byhaving itsilower end curvedlaterallyand crowded into the undercut groove to substantially fill the same."

2. "In an artificial tooth, ;avitrified body having a hole whose bottom is provided with J a substantially conical center surrounded with an undercut annular groove.

'3. I11 an artificial toothfa vitrified-body bottom is provided with a substantially conical center surrounded with an undercut annular groove, combined with'a metal attaching part having its inner end of tubularform mechanically crowded outwardly into the undercut annular groove of the tooth. 5 j 4. In anartificial tooth, a vitrified body having a hole whose'bottom is curved from the center outwardly to provide a lateral undercut groove, combined 'with an attach ing structure of metal the inner end ofwhich is annular and curved outward and mechanically crowded against the curved bottom and'into the undercut groove. '5; The method of making an artificial tooth which consists of molding a bisque tooth with a hole having a substantially conical bottom and annular undercut groove portiOm-Vitrifying the same, and thereafter mechanically securing a metal attaching 'partin the hole by forcing the said metal 

